What are you trying to do exactly? That code is an unreadable mess.

The reason you're getting a blank page is that you only return if 'Filter' 
in stuff, since "stuff" is just one of the things you get when you run dir 
on class Filters (you have p=Filters and then you do dir(p)), and since 
that class has nothing with a "Filter" in its name on its __dict__ that is 
never true.

Are you trying to program by coincidence 
<https://pragprog.com/the-pragmatic-programmer/extracts/coincidence> or 
something? 

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